Safety-relay.



Patented Sept. 21, 1909.

FIGJ.

WITNESSES:

I Todllwhmnitmayconcem:

35 post 9 on sai UNITED sTAtrEs PATENT OFFICE;

mum: 1.; 'noneson, or aocnns'raa, new

sreun. comm-n2, or earns, NEW roan,- a'conronanon or NEW/YORK.

V Be it known that I, FRANK L. Done-son, a citizen of the United States, and resident of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Safety- --Itelays, of which the following is a specifi-,

cation. v This invention relates to safety relays,

and consists in the apparatusliereinafter described and claimed.

Theobject of the invention is to provide an eflicient relay for use on ex osed circuits where there is danger from a normal currents in the circuit, o fusing, or otherwise holding the relay contacts,.an d thus maintainin acircuit. In t e drawings: tion of a relay emb relay contacts in another position.

In the drawin 1, 1 are the coils of :the

. relay. 2, 2 are-t ie-bindin posts of the cir-, he armature 3 of 'cuit through said coils. therelay is pivoted at '4 beneath the table 5. The coils 1, 1 are set vertically upon said table. .The armature 3 bears insulating posts 6, 6, carrying what may be called an' armature-bar 7- that is connected by a flexible conductin' connection 8 with a binding table. The armature bar 7 carries flexible contacts 10 and 11. The

flexible-contact 10 is the back contact of the relay, and makes electrical connection, when the coils 1 are deenergized, with a contact plate 12 connected through the ban erT13 with a suitable binding post14. The exible contact 11 is a part of the fro'ntecontact mechanism of the relay, A supplementary contact bar 15 is pivoted 'at, 16 beneath the table 5 over the flexible contact 11, and

said bar 15 bears a supplementary flexible contact 17 ada ted to makeelectrical connection with tie front contact 18-ofthe relay to which "is, connected the binding .50 post 19.

Upon the sapplementary'contact bard-'3 is pivoted ablock 20 on the pivot 21 passing through cars 22 on said bar. The block is'made of such length that'when it isfat T right angles to the supplementary bar 15,

Figure 1 is a side elevaiug this invention; 20 Fig. 2 18 a front elevation of the same, part as shown in Fig. 4, the contact 11 cannot YORK, ASSIGNOR r0 GENERAL RAILWAY I ,Speeifleatton of Letters Patent. Patented Sept. 21, 1909. Application ma comm-tie, 190a. sum No. 457,3aa.

touch the liar 15, and thus the circuit of the 7 front contact of the relay is brokeh. But

when the block 20 is tilted and rests upon I the top of the armature bar 7, as shown in mentarybar 15, and thus current ma pass" 60 Fig, 3, the contact 11 can touch the supple- I from the armature bar 7 through the exible 'j 5 contact 1'1,'the bar 15, the flexible contact 17 to the front contact 18 of the relay.

In. the ordinary operation of the .relay,

the attraction and release of the armature.

3 vibrate the bar 7,-and ,the' contact l'l make-sand breaks the electrical 00111196131011 p with the front contact 18, and current passes from the armature bar? to the front contact 18, as is usual with relays. But if, when a H the armature is attracted and the contact 17 is against the front'contact 18, an. excess ive current passes so as to fuse the contact spring 17 to the front contact 18, then, assoon as .thema ets 1 are 'deiiner ized and i'he armature 3 alls back, the supp ementary'; bar 15 remains in its higher pos tion, while the armature bar 7 returns to its lowest-position,.as shown in Figs. 1 and 3. Thereupon' the'block 2O falls into the position show'nin Fig. 4, and so maintains the separation of the bars 7 and 15' that no electrical connec tion can. occur through the contact spring l-lf.

until arepair man has broken the fused tilted position, as'shown in Fi s. 1 and 3'.'

Thus, if the front contacts of tie relay are '90 secondary circuitthrough the armature ban 4 7 is broken until the device'is'repaired.

fused, or otherwise fastened together, the

The means .for separating the armature.

bars 7 and or of 'inaintamin the break between the contact a ring ll an the bar 15,

' mustof course embo y an insulating means. One mode of dbtaining this'res'ult is to make said circuit-when one of the contacts is 1 maintainedabnormally against the other. 2. In a relay, a circuit controlled thereby,

two contacts movable by the relay and ar- I contactsand has n estor-ed the block 20- to its 7 for producing and maintaining a break in,

ranged in series in said circuit, a third con-v tact with which one movable contact eooperatcs, and-automatically movable insulating means whereby when one movable contact is maintained abnormally against the third'contact, the circuit is broken between two contacts movableby able contact cooperates,

"two contacts movable by the l the two movable contacts.

a circuit c mtrolled thereby,

the relay and arand provided In a relay,

ranged in series in said circuit with means for simultaneous movement of both and independent movement of one of them, a third contact with whlch one movable contact cotiperates, and automatic means both and independent I them, a third contact with which one mov-,

and an automatically movable insulator for-preventing cir cuit-making action through one contact after fusion or sticking of the other contact to the third contact.

. 5, In a relay, a circuit controlled thereby,

two contacts movable by the relay and a1" with means for simultaneous 39.. zthem, a third contact with which one movflable contact coiiperates,

i G. In a relay,

ranged in series in said circuit and provided v movement oi both and"independent movement ot one 0t and an automatic separatm' for preventing simultaneous circultqnalong action betweenthe movable contacts' upon abnormal maintenance of one movable contact against thethlrd contact. a circuit controlled,thereby,

two contacts movable'by the relay and arranged in series in said circuit and provided 40' with means 'for simultaneous movement of both and mdependent movei'nent of one of them, athird contact with which one mov- 1 able contact co'iiperates, and automatic means i "relay, a circuit ,itgiiin st the third contact.

. said circuit, a third for preventing simultaneous circuit-making actionof the movable contacts upon abnormal maintenance of one ,movable contactcontrolled thereby, twofindependently ,movable contacts actuated relay and arranged in series in contact with which one movable contact cooperates, andji tilting bloc "irrled by one movable contact and adapted to tilt and to prevent closing of the two movable contacts when-the movable contact 1s mamtamed agamstthe tlnrd contact.

acircuit controlled thereby,

8. In a relay,

actuated by the retwo tilting contact, bars the contactsam the two contact on one oi the bars is maintained in the secondary cn'cuit'andlay having contacts arranged in series in said circuit, one of which bars operates the second, a third contact with which one of said contacts coiiperates, and automatic means for preventing circuit-making action of the contacts on the tivo bars if the contact on a bar ismaintainedagainst the third contact.

9. In a relay, a circuit controlled thereby, two tilting contact bars actuated by the relay and having contacts arranged in series insa-id circuit, one of which bars operates the second, athird contact with which one of the said contacts coii erates, and a tilting insulating block for maintaining separatimi of bars when the said against the third. r

1 0. In a relay, a secondary cn'cuit controlled thereby, an armature, a lirst contact V movable with said armature, a second contact in series with the first contact n .said circuit and movable with the armature on a separate support, a

third contact with which the second contact coilperates, and automatic means for preventing completion of the first contact with the second after abnormal"maintenance of the second contact against the third. v

11. In circuit cont-rolled thereby, an ari'nature, an ari'nature bar movable therewith, a first cont-act carried by said armature a supplementary bar independently supported and having a second contact in series with the hrst mentioned contact and 111 the said circuit and moved by the armature bar, a third contact with which the second contact coiiperates, and automat c means for breaking and maintaining a breal; between the first and second contacts if the second contact is maintained against the third.,,..

12. In a relay, acircuit controlled thereby, an armature, an armature bar movable therewith, acontact carried by. said armature bar, a supplementary bar-independently supported and having a second contact in series with the first mentioned'contact and in the said circuit and moved by the armature bar, athird contactwith which the second contact coiiperates, and an automatically I tilting'bloelr carrred by one of said bars and aalapted to'tilt upon separation-of said bars to maintain the separation of the first -mentioned contact when thesecond mentioned contact 1s maintained agalnst the third.

FRANK'L. DODGSON. wan 3; d M

.L. Tno'iv, I). Guanine. 

